2009/07/11 by G. Fasching, Gernot Fasching, Christoph Deutsch +18 · 1 citation
Chemistry · Engineering · Physics and Astronomy · #Cascade #Coupling (piping) #Electric field #Laser #Lasing threshold #Materials science #Optics #Optoelectronics #Photonic and Optical Devices #Photonics #Physics #Quantum cascade laser #Semiconductor Lasers and Optical Devices #Semiconductor laser theory #Spectroscopy and Laser Applications #Spontaneous emission #Terahertz radiation #cond-mat.mes-hall
paper · pdf · doi:10.1364/oe.17.020321
4 pages, 4 figures
arxiv created 2009/07/11 · openalex publication_date 2009/10/23 · arxiv updated 2015/05/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We have studied the coherent intercavity coupling of the evanescent fields of two microdisk terahertz quantum-cascade lasers. The electrically controllable optical coupling of the single-mode operating lasers has been observed for cavity spacings up to 30 mum. The strongest coupled photonic molecule with 2 mum intercavity spacing allows to conditionally switch the optical emission by the electrical modulation of only one microdisk. The lasing threshold characteristics demonstrate the linear dependence of the gain of a quantum-cascade laser on the applied electric field.